Quick answer
The Patek Philippe 3700/11 is a Jumbo Nautilus: a 42mm steel sports watch with an integrated bracelet and a thin monobloc case. A replica of it can look right on the wrist, but only the better builds get three things correct. Case thickness stays under 8.5mm, the dial carries true horizontal grooves, and the bracelet tapers toward the clasp. Cheap versions miss all three. Expect to pay more for a version with a decorated automatic movement and a sapphire crystal.
Before you start
- A tape measure or calipers for case width and thickness.
- A loupe or phone macro lens for dial and engraving checks.
- A written return policy from the seller.
Original reference points
The Nautilus arrived in 1976 as a Gérald Genta design, and the 3700 family has carried the same basic case since then. The /11 suffix marks a bracelet variant inside that family, so the case and dial geometry match the other 3700 references.
- Case: 42mm wide, about 7.6mm thick, steel monobloc, rated to 120m.
- Shape: porthole profile, no crown guards, hinged bezel look.
- Dial: dark blue to black gradient, horizontal embossed grooves, applied baton markers, date at 3.
- Movement: caliber 28-255 C, an ultra-thin automatic built on the Jaeger-LeCoultre 920 base.
- Bracelet: integrated, brushed links with polished bevels, tapering to a small clasp.
How to check a replica 3700/11
Case and profile
- Measure the width across the bezel. It should read 42mm.
- Measure thickness at the center. Anything past 9mm looks inflated beside the original.
- Run a finger along the case sides. The porthole curve should be one continuous line with no step at the bezel.
- Check the case back engraving for crisp lettering and the right reference text.
- Look at the crown. It should sit small and flush, with no guards around it.
Dial and hands
- Angle the dial toward a lamp. The horizontal grooves should stay sharp with even spacing, not washed out.
- Check the gradient. The original shifts from deep blue at the edges to near black in the middle.
- Inspect the applied markers for clean edges and level seating.
- Confirm the date window sits at 3 with a color-matched disc.
- Study the hands under a loupe. The inlay should fill the frame with no gaps at the tips.
Bracelet and clasp
- Hold the watch by the case and let the bracelet hang. Links should drape instead of staying stiff.
- Trace the taper from the lugs to the clasp. The width should shrink by several millimeters.
- Check the finish on each link: brushed top surface, polished bevel.
- Open and close the clasp several times. It should snap shut with no rattle.
- Press each link pin to test for play.
Movement
- Ask the seller which base movement is used, for example a Miyota 9015 or a clone automatic.
- Set the time and watch the seconds hand for stutter.
- Wind it and tilt the case to listen for rotor noise.
- Leave it off the wrist overnight to check power reserve.
Sizing and fit
The 3700/11 wears wide and thin. The case spans 42mm, but the integrated bracelet keeps the effective lug-to-lug short, so a wrist between 6.5 and 7.5 inches suits it. Ask the seller for extra links before you buy, because this bracelet does not accept standard aftermarket straps without an adapter.
Price bands
Entry versions run about $120 to $200 with mineral glass and stamped dials. Mid tier sits near $250 to $450 and adds sapphire, a decorated rotor and a bracelet with better articulation. Top tier starts around $500 and up, where the case profile, dial texture and clasp finish come closest to the reference.
Care and wear
- Do not swim with a replica unless the seller pressure-tested it.
- Wipe the case and bracelet with a dry microfiber cloth after each wear.
- Store the watch on a padded roll so the bracelet holds its curve.
- Have a watchmaker check the gaskets once a year if you wear it daily.